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| Numerical 04 |
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| 04. A copper disc of radius 10 cm rotates 1200 times per minute with its plane perpendicular to a uniform magnetic field. If the induced EMF between the edge and centre of disc is 6.284 mV, find the density of the field. |
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| Suggested solution: |
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| Area of disc |
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| n = 1200 rpm = 20 rps, E = -6284 x 10-3 V, B = ? |
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| Area swept in 1 second |
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